Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d6065108e19f491…

MALICIOUS

PDF

81.5 KB Created: 2021-03-16 02:36:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb5cc61ae7e4d628947e47b913ec0b88 SHA-1: 21360dcd4370d9ac774804e3beec7fe862602414 SHA-256: 6d6065108e19f491735798dc73faeb68cba48a3440055ed5aa165c5016cd3978
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, a technique often used in link farm attacks to direct users to malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing or a trojan. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pelibifir.ru/strik?utm_term=3+modes+of+fracture
    • https://static.s123-cdn-static.com/uploads/4467005/normal_5ffeb388b6719.pdf
    • https://cdn-cms.f-static.net/uploads/4443325/normal_600e86962fa14.pdf
    • http://vejawezodasupax.22web.org/baila_samba_conmigo_line_dance.pdf
    • http://polfact.site/59916718058ja69z.pdf
    • http://reduslim-officialsite.site/150773804915jlm3.pdf
    • http://teenagetutor.online/mijijusuzosatilavolevujibavmx.pdf
    • http://nasty666.space/team_building_forming_norming_storming_performing_pptfclg2.pdf
    • http://detonicufficiale.website/best_polaroid_template_appaowgi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://02687da8-bf2b-436b-a8ca-82c6e04513a5.filesusr.com/ugd/e48f8a_a79a79d27016408598de03a70a46c991.pdf?index=true
    • http://nigojelur.epizy.com/aqa_a_level_physics_examiners_report_2018.pdf
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_36b18b29e32948478eec38ce118896d6.pdf?index=true
    • https://s3.amazonaws.com/zepifudoxapo/romizejiwukujegosik.pdf
    • https://s3.amazonaws.com/jopomodilamego/ansi_c_programming_book_free.pdf
    • https://78ee58ad-4251-4cb6-9d9e-6f806931ac90.filesusr.com/ugd/b6b4e8_8f53dc7e13bb41068e693f0a866617ea.pdf?index=true
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_3cfe74e440924d3ea040b136ac7d6802.pdf?index=true
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_a22bebece8574ba0b18aea35e27da44f.pdf?index=true
    • https://s3.amazonaws.com/redegelesibif/47030608493.pdf
    • https://6e3eaeb2-b9dd-4462-8b56-96c59beebd9a.filesusr.com/ugd/dcc11b_acd5a67c4849405789e13691b14e75f2.pdf?index=true
    • https://95fbbc11-640f-4658-acdf-6e09da746871.filesusr.com/ugd/e42ee3_c502688b0ff9401ba39b155eb6d37db8.pdf?index=true
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_8fdb4f90062b4ab59fc1df2d2c95da18.pdf?index=true
    • https://s3.amazonaws.com/nokiva/45933765655.pdf
    • https://doi.org/10
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010087.bin
32734be9facafbd927eb0408f2e4d1fd70783996c26a096e34d8f494dec24d58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10087 5204 bytes
font_01_sfnt_off0001121d.bin
63c048accb0f4d0a1f1cac6c905b850ef64ef3f332250ccd5506bee300d1067c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1121D 11344 bytes

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